I have this issue as well.
Was it a force close or cooperative.
Does umbrel show you a closing transaction?
If yes, is the closing transaction also visible publicly at mempool.space?
Discussion
I close from the Umbrel Lightning UI, I guess it's a cooperative close, and no closing tx shows yet.
maybe it's because my peer is not responding, so I wander if there's way to change to force close?
If I were you I would install a proper channel management tool like Thunderhub or Ride the lightning (RTL).
And see the channel closing status in that.